Cheapest priced copy (Outlaws of Thunder Junction): $0.35 at Card Kingdom, near mint, their price list as of .
Steer Clear 
Instant · Common · Outlaws of Thunder Junction · #31
Steer Clear deals 2 damage to target attacking or blocking creature. Steer Clear deals 4 damage to that creature instead if you controlled a Mount as you cast this spell.
Legal inCommanderBrawlStandardPioneerModernLegacyVintagePauper
1 printing · $0.35 to $0.49 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Outlaws of Thunder Junction | 31 | Common | $0.35 | $0.49 |
One ruling from Wizards of the Coast
- 12 April 2024If you controlled a Mount as you finished casting Steer Clear, it doesn’t matter whether you still control one as the spell resolves. Steer Clear will still deal 4 damage.